Dan
Thank you for bringing me back to earth! I have spent so much time recently learning about the 45th and other British regiments in mid-Victorian times, it never occurred to me that the soldier could have been a Natal Colonial. That indeed is what he was, and his regiment was almost certainly the Natal Carbineers, a mounted infantry regiment armed with the Martini Henry carbine, just as Bayern surmised. The illustration below is from the history of the NC by the Rev John Stalker, which was published in 1912. Adding to my embarrassment is the fact that I use the helmet badge of this regiment as my avatar. During the Anglo-Zulu War (1879), the men in the photograph below would have worn this badge on a white helmet.
Than you again to Mike, Bayern and Dan.
Regards
Brett
The illustration below, which was painted by the late Andy May, shows the active service helmet worn by the Natal Carbineers during the Anglo-Zulu War. Although it is not clear in this picture, the helmet badge is that shown in my avatar.
Brett

Mike & Bayern
Many thanks for your comments. I also felt that the soldier must have been post-1850's. For many months now, I have kept busy gathering information on the 45th Regiment during the 16 years (1843 - 1859) it spent in the Colony of Natal, and I have yet to find any depictions of its men in the uniforms of the period.
Regards
Brett

Tony, a very interesting development! Thank you for sharing your discovery. The Union Club of South Africa was another local patriotic society that produced enamelled brass badges for its members - a new variant each year. I had a small collection of them that is now with my younger son in the UK.
Regards
Brett

Sampo
Thank you again for more striking medals. I am impressed by the colourful ribbons and the elaborate designs of the medals themselves.. I wonder if they are as expensive as they look?
Regards
Brett

Brian, perhaps a solution would be to have a 'Remembrance Sunday ' closest to 11 November, although in (some of) our increasingly godless societies fun now comes first on Sundays, so that may not work either.
Regards
Brett

The SAC was raised during the Boer War, and, in spite of their name, they functioned as mounted infantry, hence the use of 'Trooper' for the lowest rank. Even in peacetime in South Africa, there was a need for mounted police, and many of the SAC men deployed in the Orange Free State and Transvaal were mounted. The same applied to the police in the Cape Colony and Natal, and the tradition of using 'Trooper' continued. In the case of Natal, 'Constable' referred to policemen employed in court duties, and their rank was equivalent to that of Sergeant in other branches of the force.
Brett